The Good: Handles like a scalpel.
Cheap PC Works pipe and shorty will restore explosive 05/06 powerband(at a small over-rev cost) that 07 re-porting tamed.
Cheap to buy, cheap to fix.
Developing Popeye forearms to hold on when it hooks up.
The Bad: If you've only ridden 4Ts, expect a learning curve. This isn't some 4T tractor with lbs of gyroscopic rotating mass right under your balls resisting leaning.
If you've only ridden 4Ts, you will overshoot some corners and stall the engine while you learn how to use brakes with no engine braking to help.
Sprained cheek muscles from all the grinning.
If you're bored riding essentially the exact same bike as everybody else, just in a different color, on the same lines, sounding exactly the same, get a 2T. It'll be a challenge to learn and master, you can take different lines and they'll hear you coming.
And they're cheap. Did I bring up that they're cheap?
** Point not valid when talking about 2012 KTM 250SX with PC Works pipe and Shorty. Especially with a KTM 300SX kit. 60+HP.